Improved truck physics v1.4

Mod aimed at the players, who want more difficult and life like physics in ETS2. It adds lots of changes to almost parameters, related to truck and driver behavior.
This version contains major changes, compared to previous 1.3 version. To start with, it now goes back to traditional (for this mod) system of custom chassis files.
Also, there is no more soft and normal versions, there is one, "suitable for all" version.